diff --git a/requirements.txt b/requirements.txt
index a9f67c1cb..2158c25ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 # web_widget_bokeh_chart
 bokeh==1.1.0
 # web_widget_mpld3_chart
-matplotlib>=2.0.0
+matplotlib==3.0.3; python_version < '3.7'
+matplotlib==3.4.1; python_version >= '3.7'
 mpld3==0.3